Valid for:





Embedded Integrator

Virtual Integrator


The device will send an empty SIP message with just 2 * CRLF to the platform in configurable time interval to keep the NAT firewall open.

  • New in software 2.42.0 or higher
  • UDP
    • NAT refresh timer is set by default to 0 seconds
    • Timer = 0 means feature is disabled
    • Timer can be changed via auto-provisioning ("SipProvider.0.UDPKeepAliveTimerValue")
  • TCP
    • Is activated automatically and set for 90 seconds
  • Feature is a platform related setting, if device has more SIP accounts, it does not send an UDP package per SIP account. It sends only one package every 20 seconds.
  • Nx70 will send UDP / TCP packages containing only 2 x CR,LF	UDP	5060 → 5060 Len=4

Data (4 bytes)
    Data: 0d0a0d0a
    [Length: 4]


provisioning template example

<?xml version="1.0" encoding="UTF-8"?>
<provisioning version="1.1" productID="e2">


<param name="SipProvider.0.UDPKeepAliveTimerValue" value="20"/>



From software 2.53 or higher, we have added the UDP NAT refresh timer in the web-interface:

Go to: SETTINGS - Provider or PBX profiles - UDP keep-alive

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